onrush in WordNet English dictionary

1. (military) an offensive against an enemy (using weapons)
   "the attack began at dawn"
   attack  onslaught  onset  onrush 
   
2. a forceful forward rush or flow
   "from the bow she stared at the mesmerising onrush of the sea where it split and foamed"; "the explosion interrupted the wild onrush of her thoughts"
   onrush